Question

4) Use technology and the given confidence level and sample data to find the confidence interval for the population mean mu. Assume that the population does not exhibit a normal distribution.

Weight lost on a diet:

95 % confidence

n =61

x =2.0 kg

s = 3.9 kg

What is the confidence interval for the population mean mu​?

Kg<µ<kg

5) Listed below are the amounts of mercury​ (in parts per​ million, or​ ppm) found in tuna sushi sampled at different stores. The sample mean is 0.957 ppm and the sample standard deviation is 0.363 ppm. Use technology to construct a 90​% confidence interval estimate of the mean amount of mercury in the population.

1.03

0.83

1.48

0.92

0.51

1.35

0.58

What is the confidence interval estimate of the mean amount of mercury in the​ population?

Ppm< µ< ppm

7) In order to estimate the mean amount of time computer users spend on the internet each​ month, how many computer users must be surveyed in order to be 95​% confident that your sample mean is within 14 minutes of the population​ mean? Assume that the standard deviation of the population of monthly time spent on the internet is 202 min. What is a major obstacle to getting a good estimate of the population​ mean? Use technology to find the estimated minimum required sample size.

Answer 1